The interest in​ the​ free-agent​ left-hander is​ expected​​ to result in him receiving six-year offers, if he hasn’t already.

Corbin, 29, will not necessarily agree to a six-year contract, particularly if it is loaded with deferrals. He also could accept five years at a higher average annual value from a preferred club. But at six years, his value probably would exceed the largest contract awarded to a free-agent starting pitcher last offseason — six years, $126 million to righty Yu Darvish.

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The Nationals almost certainly are at six years or will get to that level with Corbin. General manager Mike Rizzo is “seriously focused” on the pitcher, one source said, and two of the Nats’ current starters, righties Max Scherzer and Stephen Strasburg, are on seven-year deals. Both of those contracts, however, include heavy deferrals, and the Nats would figure to take the same course with Corbin.

The Phillies’ front office is not comfortable with long-term deals for starting pitchers, and the potential need to go six years on Corbin would be a measure of how serious they are about landing top talent this winter. The Phils signed free-agent righty Jake Arrieta to a three-year $75 million contract last offseason in part because they preferred the shorter term. Owner John Middleton, though, has said he is willing to get “stupid” in free agency, and even at six years Corbin might command less than half of what the top two position players on the market, Bryce Harper and Manny Machado, are expected to be guaranteed.

Which leaves the Yankees, the presumed favorite in the Corbin sweepstakes, considering the pitcher grew up a fan of the team in a suburb of Syracuse, N.Y. The Yankees already have traded for left-hander James Paxton, and the addition of Corbin to a rotation that already includes righties Luis Severino and Masahiro Tanaka would make a 100-win club that much more formidable.

The 29-year-old Corbin went 11-7 with a 3.15 ERA in 2018 and finished fifth in voting for the National League Cy Young Award.